Alert archive / Kentucky / Tornado Watches in 2015

Tornado Watch 23

April 3, 201559 counties in Kentucky; 43 counties in Tennessee; Lee County, Virginia

The Storm Prediction Center issued this tornado watch at Apr 3, 2015, 3:10 PM CDT for 59 counties in Kentucky; 43 counties in Tennessee; Lee County, Virginia. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
Apr 3, 2015, 3:10 PM CDT (20:10 UTC)
Expired
Apr 3, 2015, 9:12 PM CDT
In force
6 hr
Issued by
the Storm Prediction Center
Largest hail expected
2 in
Strongest gust expected
65 kt
All 103 counties

Adair County, KY, Anderson County, KY, Bath County, KY, Bell County, KY, Bourbon County, KY, Boyle County, KY, Breathitt County, KY, Casey County, KY, Clark County, KY, Clay County, KY, Clinton County, KY, Cumberland County, KY, Elliott County, KY, Estill County, KY, Fayette County, KY, Fleming County, KY, Floyd County, KY, Franklin County, KY, Garrard County, KY, Green County, KY, Harlan County, KY, Harrison County, KY, Jackson County, KY, Jessamine County, KY, Johnson County, KY, Knott County, KY, Knox County, KY, Laurel County, KY, Lee County, KY, Leslie County, KY, Letcher County, KY, Lincoln County, KY, Madison County, KY, Magoffin County, KY, Marion County, KY, Martin County, KY, McCreary County, KY, Menifee County, KY, Mercer County, KY, Metcalfe County, KY, Monroe County, KY, Montgomery County, KY, Morgan County, KY, Nicholas County, KY, Owsley County, KY, Perry County, KY, Pike County, KY, Powell County, KY, Pulaski County, KY, Rockcastle County, KY, Rowan County, KY, Russell County, KY, Scott County, KY, Taylor County, KY, Washington County, KY, Wayne County, KY, Whitley County, KY, Wolfe County, KY, Woodford County, KY, Anderson County, TN, Bedford County, TN, Bledsoe County, TN, Blount County, TN, Bradley County, TN, Campbell County, TN, Cannon County, TN, Claiborne County, TN, Clay County, TN, Coffee County, TN, Cumberland County, TN, DeKalb County, TN, Fentress County, TN, Grainger County, TN, Grundy County, TN, Hamblen County, TN, Hamilton County, TN, Hancock County, TN, Hawkins County, TN, Jackson County, TN, Jefferson County, TN, Knox County, TN, Loudon County, TN, Marion County, TN, Marshall County, TN, McMinn County, TN, Meigs County, TN, Monroe County, TN, Morgan County, TN, Overton County, TN, Pickett County, TN, Polk County, TN, Putnam County, TN, Rhea County, TN, Roane County, TN, Scott County, TN, Sequatchie County, TN, Sevier County, TN, Smith County, TN, Union County, TN, Van Buren County, TN, Warren County, TN, White County, TN, Lee County, VA

The radar

The Jackson,KY radar (KJKL), 105 km from the middle of the area, began a volume at 20:11 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

What SPC expected

The probabilities SPC published with the watch, for the watch area over its life.

Two or more tornadoes
60%
One or more EF2 to EF5 tornadoes
50%
Ten or more severe wind reports
60%
One or more gusts of 65 knots or more
30%
Ten or more severe hail reports
40%
One or more hailstones of 2 inches or more
30%
Six or more combined severe hail and wind reports
95%

Warnings issued inside it

24 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
Apr 3, 3:39 PM CDTFlash Flood WarningJKLBath, Elliott, Fleming, Montgomery, Rowan7 hr
Apr 3, 4:22 PM CDTSevere Thunderstorm WarningJKLBath, Menifee, Montgomery, Morgan, Rowan23 min
Apr 3, 4:41 PM CDTFlash Flood WarningJKLBath, Elliott, Johnson, Menifee, Montgomery, Morgan and 1 more4 hr
Apr 3, 5:27 PM CDTSevere Thunderstorm WarningJKLElliott, Johnson, Martin, Morgan33 min
Apr 3, 5:29 PM CDTSevere Thunderstorm WarningOHXDeKalb, Smith, Wilson31 min
Apr 3, 5:40 PM CDTSevere Thunderstorm WarningOHXCannon, DeKalb, Rutherford, Wilson35 min
Apr 3, 5:43 PM CDTFlash Flood WarningJKLMartin3 hr
Apr 3, 5:58 PM CDTSevere Thunderstorm WarningOHXJackson, Putnam, Smith, White47 min
Apr 3, 6:02 PM CDTSevere Thunderstorm WarningOHXCannon, DeKalb, Van Buren, Warren, White43 min
Apr 3, 6:04 PM CDTSevere Thunderstorm WarningOHXCumberland26 min
Apr 3, 6:07 PM CDTSevere Thunderstorm WarningMRXLoudon, Morgan, Roane53 min
Apr 3, 6:14 PM CDTSevere Thunderstorm WarningOHXCannon, Coffee, Rutherford, Warren46 min
Apr 3, 6:35 PM CDTFlash Flood WarningJKLEstill, Lee, Menifee, Powell, Wolfe3 hr
Apr 3, 6:35 PM CDTSevere Thunderstorm WarningMRXGrainger, Greene, Hamblen, Hancock, Hawkins, Sullivan and 1 more40 min
Apr 3, 6:41 PM CDTSevere Thunderstorm WarningOHXCoffee, Grundy, Van Buren, Warren49 min
Apr 3, 6:51 PM CDTSevere Thunderstorm WarningOHXCumberland, White39 min
Apr 3, 6:54 PM CDTSevere Thunderstorm WarningMRXAnderson, Knox, Loudon, Morgan, Roane51 min
Apr 3, 7:12 PM CDTSevere Thunderstorm WarningMRXBledsoe, Hamilton, Meigs, Rhea, Roane48 min
Apr 3, 7:27 PM CDTSevere Thunderstorm WarningMRXMarion, Sequatchie48 min
Apr 3, 7:29 PM CDTSevere Thunderstorm WarningOHXGrundy, Van Buren, Warren22 min
Apr 3, 7:46 PM CDTSevere Thunderstorm WarningMRXBlount, Loudon, McMinn, Monroe44 min
Apr 3, 7:58 PM CDTSevere Thunderstorm WarningMRXBradley, Hamilton, McMinn, Meigs, Monroe, Polk62 min
Apr 3, 8:13 PM CDTSevere Thunderstorm WarningMRXMarion, Sequatchie47 min
Apr 3, 8:45 PM CDTFlash Flood WarningJKLElliott4 hr

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 12:00Z, 8.2 hours before the alert went out and 233 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Nashville Metro, TN at 12:00Z on 2015-04-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 135 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Nashville Metro, TN at 12:00Z on 2015-04-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 274 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
135 J/kg
Mixed-layer CIN
-75 J/kg
Mixed-layer LCL
990 m above ground
0-6 km bulk shear
46 kt
0-1 km storm-relative helicity
274 m²/s²
0-3 km storm-relative helicity
325 m²/s²
Significant tornado parameter
0.2
Supercell composite
1.6

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

266 
WWUS20 KWNS 032017
SEL3  
SPC WW 032017
KYZ000-TNZ000-VAZ000-040400-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 23
NWS STORM PREDICTION CENTER NORMAN OK
410 PM EDT FRI APR 3 2015

THE NWS STORM PREDICTION CENTER HAS ISSUED A

* TORNADO WATCH FOR PORTIONS OF 
  CENTRAL AND EASTERN KENTUCKY
  MIDDLE AND EASTERN TENNESSEE
  FAR SOUTHWEST VIRGINIA

* EFFECTIVE THIS FRIDAY AFTERNOON FROM 410 PM UNTIL MIDNIGHT EDT.

* PRIMARY THREATS INCLUDE...
  A FEW TORNADOES LIKELY WITH A COUPLE INTENSE TORNADOES POSSIBLE
  SCATTERED DAMAGING WINDS LIKELY WITH ISOLATED SIGNIFICANT GUSTS
    TO 75 MPH POSSIBLE
  SCATTERED LARGE HAIL AND ISOLATED VERY LARGE HAIL EVENTS TO 2
    INCHES IN DIAMETER POSSIBLE

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 95 STATUTE
MILES EAST AND WEST OF A LINE FROM 30 MILES WEST NORTHWEST OF
HUNTINGTON WEST VIRGINIA TO 45 MILES SOUTHWEST OF CROSSVILLE
TENNESSEE.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU3).

PRECAUTIONARY/PREPAREDNESS ACTIONS...

REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
TORNADOES AND SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH
AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR
THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS
AND POSSIBLE WARNINGS.

&&

OTHER WATCH INFORMATION...CONTINUE...WW 22...

DISCUSSION...TSTMS EXPECTED TO INCREASE IN COVERAGE/STRENGTH ACROSS
WW THROUGH THIS EVE IN RESPONSE TO CONTINUED SFC HEATING...THE
GRAZING INFLUENCE OF MID-MS VLY SHORTWAVE TROUGH...AND THE APPROACH
OF WRN KY-TN COLD FRONT. WIND FIELD WILL REMAIN FAVORABLE FOR
SUSTAINED UPDRAFTS/SUPERCELLS THROUGHOUT WW. HOWEVER...PRESENCE OF
EXISTING LEFT-SPLIT STORMS AND OTHER CONVECTION/CLOUDS WILL KEEP
LOW-LVL UPLIFT FIELD AND...POTENTIALLY...THE SVR THREATS MORE
FRAGMENTED IN KY RELATIVE TO TN. THE GREATEST SVR
POTENTIAL..INCLUDING THE RISK FOR A STRONG TORNADO OR TWO...MAY
EVOLVE ALONG W-E OUTFLOW BOUNDARY STALLED OVER NRN TN.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 65 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
500. MEAN STORM MOTION VECTOR 27040.


...CORFIDI

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 2, 7:32 PM CDTMesoscale DiscussionSPCBoone, Breckinridge, Bullitt, Butler, Caldwell, Carroll and 27 more58 min
Apr 2, 10:41 PM CDTSevere Thunderstorm WatchSPCBallard, Carlisle, McCracken6 hr
Apr 3, 3:39 AM CDTMesoscale DiscussionSPCBallard, Carlisle, Livingston, McCracken66 min
Apr 3, 11:56 AM CDTMesoscale DiscussionSPCAdair, Allen, Ballard, Barren, Boyle, Breckinridge and 48 more94 min
Apr 3, 12:14 PM CDTTornado WatchSPCAllen, Ballard, Barren, Breckinridge, Bullitt, Butler and 39 more8 hr
Apr 3, 2:23 PM CDTMesoscale DiscussionSPCAdair, Allen, Anderson, Barren, Bath, Bell and 96 more97 min
Apr 3, 5:10 PM CDTMesoscale DiscussionSPCBoyd, Greenup95 min
Apr 3, 5:43 AM CDTMesoscale DiscussionSPCLake2 hr
Apr 3, 3:57 PM CDTMesoscale DiscussionSPCChester, Fayette, Giles, Hardeman, Hardin, Lawrence and 4 more93 min
Apr 3, 5:54 PM CDTMesoscale DiscussionSPCCannon, Cumberland, DeKalb, Fentress, Jackson, Morgan and 9 more66 min
Apr 3, 6:48 PM CDTSevere Thunderstorm WatchSPCFranklin, Lincoln, Moore4 hr

Nearby

Tornado Watches in Kentucky, 2015Tornado Watches in Tennessee, 2015Tornado Watches in Virginia, 2015Every tornado watch in 2015

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.